<template>
  <div>
    <span v-for="(item,index) in arr" :key="index"><input type="checkbox" v-model="arr1" :value="item">{{item  }}</span>
    <p>你选中的元素, 累加的值和为: {{ theSum }}</p>
  </div>
</template>

<script>
export default {
 data(){
   return{
     arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
     arr1:[]
   }
 },
 computed:{
   theSum(){
     return this.arr1.reduce((sum,item)=>sum+=item,0)
   }
 }
}
</script>

<style>

</style>